The7400-year long tree-ring width (TRW) chronology from Torneträsk, northern Sweden. The chronology has been used in a number of Northern Hemisphere climate reconstructions (e.g. Briffa et al 1992, Wilson et al 2015). A climate reconstruction based on maximum density (MXD) captures 63-64% of the inter-annual summer temperature variation.

Grudd, H., Briffa, K.R., Karlen, W., Bartholin, T.S., Jones, P.D. and Kromer, B.  2002.  A 7400-year tree-ring chronology in northern Swedish Lapland: natural climatic variability expressed on annual to millennial timescales.  The Holocene 12: 657-665.

Grudd, H. 2008. Torneträsk tree-ring width and density AD 500-2004: a test of climatic sensitivity and a new 1500-year reconstruction of north Fennoscandian summers. Climate Dynamics, Vol. 31, pp. 843-857.  DOI:10.1007/s00382-007-0358-2

In the Scottish highlands we aim to develop a multi-millennium tree-ring chronology from semi-natural pine woodlands to reconstruct the climatic and environmental history of the region back into the early Holocene (Scottish Pine Project)

Rydval M., Larsson, L-Å., Mcglynn L., Gunnarson, B.E., Loader N.J and Wilson R., 2014: Blue Intensity for Dendroclimatology: Part I - Should we have the blues?  Experiments from Scotland. Dendrochronologia, 32, 191-204. DOI: 10.1016/j.dendro.2014.04.003

Rob Wilson, Kevin Anchukaitis, Keith R. Briffa, Ulf Büntgen, Edward Cook, Rosanne D'Arrigo, Nicole Davi, Jan Esper, Dave Frank, Björn Gunnarson, Gabi Hegerl, Samuli Helama, Stefan Klesse, Paul J. Krusic, Hans W. Linderholm, Vladimir Myglan, Timothy J. Osborn, Miloš Rydval, Lea Schneider, Andrew Schurer, Greg Wiles, Peng Zhang, Eduardo Zorita, Last millennium northern hemisphere summer temperatures from tree rings: Part I: The long term context, Quaternary Science Reviews, Volume 134, 1-18,

In the Scandinavian mountains we have developed a network of high quality density and blue intensity data in an attempt to provide a more spatially coherent view of summer (June–August,JJA) temperature variability within the last millennium.

Gunnarson, B.E., Linderholm, H.W. and Moberg, A. 2011: Improving a tree-ring reconstruction from west-central Scandinavia - 900 years of warm-season temperatures. Climate Dynamics 36, 97-108.

Linderholm, H. W. Bjorklund, J. A. Seftigen, K. Gunnarson, B. E., Fuentes, M. 2015 Fennoscandia revisited: a spatially improved tree‑ring reconstruction of summer temperatures for the last 900 years. Clim Dyn 45, 933-947. DOI 10.1007/s00382-014-2328-9


Two examples using Energy Dispersive X-ray Fluorescence (ED-XRF); Sulfur and iron accumulation in marine-archaeological shipwrecks in the Baltic Sea and chlorinated solvents from an old industrial site where tree rings had anomalously high concentrations of chlorine (Cl) as an indicator of potential contamination.

Fors F., Grudd H., Rindby A., Jalilehvand f., Sandström M., Ingemar Cato I., Lennart Bornmalm L. 2014: Sulfur and iron accumulation in three marine-archaeological shipwrecks in the Baltic Sea: The Ghost, the Crown and the Sword.  Scientific Reports 4, 4222. doi:10.1038/srep04222

Balouet, J.C., Burken, J.G., Karg, F., Vroblesky, D., Smith, K.T., Grudd, H., Rindby, A., Beaujard, F., Chalot, M., 2012: Dendrochemistry of Multiple Releases of Chlorinated Solventsat a Former Industrial Site. Environmental Science & Technology 46,9541–9547. doi:10.1021/es300318v


Analysis of tree-rings and soil samples using Energy Dispersive X-ray Fluorescence (EDXRF) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to identify, characterize and date past pollutions events caused by former glass industries in Southern Sweden. This project is a collaboration between the Stockholm University and Linnaeus University.


Top left: Proxy locations. Middle Left: proxy reconstructed hydro climate. Bottom left: comparison of multi-proxy and multiple GCM simulations of centennial variations in hydroclimate (b) proxy reconstruction (c) model simulations. Right: (panel A), Comparison 8 proxy archives of centennially varying NH temperature anomalies. Panel B, multi- proxy centennial variability by continent. Panel C, by latitude, and Panel D, by temperature sensitive of proxy.

Ljungqvist, F.C., P.J. Krusic, H.S. Sundqvist, E. Zorita, G. Brafström, D. Frank, (2016). Northern Hemisphere hydroclimate variability over the past 12 centuries. Nature.

Ljungqvist, F.C., P.J. Krusic, G. Brafström, H.S.Sundqvist, (2012). Northern Hemisphere temperature patterns In the last 12 centuries Clim. Past.